For the second part, the percentage of positive Meixner test interpretation was determined by grouping the low and high amounts of each analyte together (the 100 ug and 200 ug of 5-hydroxytrytamine,etc). In addition , all 4 samples of the 5-substituted tryptamines were analyzed together as one group. The amount of amanitin determined in the first experiment was used as the criterion standard for a positive test. Fisher's exact test was used to determine the presence of any statistical difference (P